---
id: "CVE-2013-3893"
kind: "vulnerability"
aliases: ["CVE-2013-3893"]
title: "Use-after-free vulnerability in the SetMouseCapture implementation in mshtml.dll in Microsoft Internet Explorer 6\u2026"
severity: "critical"
cvss: 9.3
epss: null
exploited: true
status: "open"
category: "other"
products: [{"name": "Microsoft Internet Explorer", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft internet explorer", "fixed": [], "affected": "= 6", "ecosystem": "vendor"}, {"name": "microsoft internet explorer", "fixed": [], "affected": "= 7", "ecosystem": "vendor"}, {"name": "microsoft internet explorer", "fixed": [], "affected": "= 8", "ecosystem": "vendor"}, {"name": "microsoft internet explorer", "fixed": [], "affected": "= 9", "ecosystem": "vendor"}, {"name": "microsoft internet explorer", "fixed": [], "affected": "= 10", "ecosystem": "vendor"}, {"name": "microsoft internet explorer", "fixed": [], "affected": "= 11", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "internet-explorer", "other", "windows"]
not_affected_if: ["ie-removed", "no-ie-installed"]
published_at: "2013-09-18T10:08:24+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T22:29:05+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2013-3893", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2013-3893", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# Use-after-free vulnerability in the SetMouseCapture implementation in mshtml.dll in Microsoft Internet Explorer 6…

Microsoft Internet Explorer has a memory corruption flaw that lets a remote attacker run code on the victim's machine. CISA lists it as actively exploited in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft Internet Explorer affected ? fixed ?
- vendor:microsoft internet explorer affected = 6 fixed ?
- vendor:microsoft internet explorer affected = 7 fixed ?
- vendor:microsoft internet explorer affected = 8 fixed ?
- vendor:microsoft internet explorer affected = 9 fixed ?
- vendor:microsoft internet explorer affected = 10 fixed ?
- vendor:microsoft internet explorer affected = 11 fixed ?

## How to check

Check whether any Internet Explorer version is installed or used as a browser on the team's machines, including IE as a rendering engine in legacy apps.

## Fix

Discontinue Internet Explorer use and move to a supported browser; apply Microsoft's mitigations if IE must remain in use.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2013-3893
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2013-3893

## From the sources

Microsoft Internet Explorer contains a memory corruption vulnerability that allows for remote code execution. The impacted products could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.

CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_